TWO THINGS : first check that amp has a good ground , I mean connected to the chassis of vehicle .

second , check the connections of the speakers , it could be Unbalance , meaning not matching the value in OHMS of AMP with value in OHMS of speaker,
you will need a multimeter for this task . hope this helps

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Related Questions:

If you are referring to the Kicker L5 solo-baric subwoofer, then an 800 watt peak amp will not blow even one of those subs. The L5 is capable of handling 1000 watts peak and 500 wrms. An 800 watt peak amp will usually have around 400 wrms. Underpowering the subwoofer will not hurt the amp or the sub(s).

It sounds like one or more of the output components is failing on the amp. You can contact Kicker support directly for instructions to return the amp for repair: support@kicker.com . Alternatively, if you have a local car audio shop that does component level repairs, they could perhaps save you some money and time.

Disconnect any speaker from the amp then re-power. If it still goes into protection, your amp needs serviced. Shorted output transistors most likely. And check your Sub for shorts as well. If the voicecoil on the sub is burnt, it will short any amp. If you can use a meter, check the resistance on the sub. Hope this helps

make sure the impedance is right for the amp you're using. If you're using a 4ohm amp and a 2ohm sud that may be the problem. It may be overdriving the amplifer which is bad and can cause damage to the amp. Hope this helps.

The Kicker 08ZX400.1 would be a great amp for your subwoofer. It will work into a 4ohm load with no problems.

But you can buy an amp with more power, looks better, has a smaller footprint, and cost less than the 400.1. I'd look at the Alpine MRP-M500. Take a look at it here at Crutchfield. The M500 is also easy to install, runs cool, and is very efficient.

recommended maximum for the sub boxes is 1600/800
here is the link to the manual if you need it;
http://www.kicker.com/06/tech-support/manuals/manuals/2007/2007%20CompVR%20Box%20d01%20Web.pdf
If you really wanted to get the maximum from your subs then a zx750, or possibly a zx1000 would be the ideal choice. Either amp you suggested will work, but you will have more fun with a 750 which should do fine.
Hope this helps :)